Solved

Handling Null Array Locations in a Loop

Posted on 2002-03-06
9
139 Views
Last Modified: 2013-12-24
Hi,

I am writing an online reservation system. I have catagorys of rooms, then individual blocks of rooms in them. To show preferance, to sea front over other catered rooms, you would select a number for the catagory of room, then for the blocks assing a perferance (all down with drop down lists).

im creating a 2D array from this data, then running through it to write out a list of prefered accomodation.

The drop down lists have values that i use as the array index, but as not all catagorys and blocks need a preferance assinged i need a way of skiping over null values.

Is there a simple if(array[x][y].isNull) method? Any other ideas?

Thanks, GR.
0
Comment
Question by:googlyralph
  • 4
  • 4
9 Comments
 
LVL 19

Expert Comment

by:cheekycj
ID: 6844581
something like

<cfif LEN(TRIM(myArrayVariable[x][y])) EQ 0>
  <!--- handle null --->
<cfelse>
  <!--- handle not null --->
</cfif>

Assuming your data is strings.

CF has the nice capability of being typeless so everthing can be seen as a string.

CJ
0
 
LVL 1

Author Comment

by:googlyralph
ID: 6846871
Nope, that doesn work, still get an error. The code im using to "squash" the array out is:

  temp = ArrayNew(1);
  for(x = ArrayLen(accomOrder); x gt 1; x = x - 1){
    temp = accomOrder[x];
    if(len(trim(temp[1])) eq 0){
       ArrayDeleteAt(accomOrder, x);
       continue;
    }
    for(y = ArrayLen(temp); y gt 1; y = y - 1){
       if(len(temp[y]) lt 1){
          ArrayDeleteAt(accomOrder[x], y);
       }
    }
  }


What (i think) its doing:
geting a copy of a 1d array representing a single row in the "table" im making, if the first value is null, then delete the row and run the loop again.
if it gets to a row where the first location is not null, then move along it from right to left, deleting locations in the original 2d array that are null.

Anyone see anything wrong with this code? Any more sugestions?

Cheers, GR.
0
 
LVL 1

Author Comment

by:googlyralph
ID: 6846876
This is the error:

The element at position 1 in dimension 1 of object "temp" cannot be found. That dimension of the object is empty. Please, modify the index expression.


The error occurred while processing an element with a general identifier of (CFSCRIPT), occupying document position (1:1) to (1:10) in the template file e:\tempwebroot\current\test\hallselectconfirm\execute.cfm.
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6847822
Have you tried it without using a temp array?

for(x = ArrayLen(accomOrder); x gt 1; x = x - 1){
   if(len(trim(accomOrder[x])) eq 0){
      ArrayDeleteAt(accomOrder, x);
      continue;
   }
   for(y = ArrayLen(accomOrder[x]); y gt 1; y = y - 1){
      if(len(accomOrder[x][y]) lt 1){
         ArrayDeleteAt(accomOrder[x], y);
      }
   }
 }
0
Network it in WD Red

There's an industry-leading WD Red drive for every compatible NAS system to help fulfill your data storage needs. With drives up to 8TB, WD Red offers a wide array of solutions for customers looking to build the biggest, best-performing NAS storage solution.  

 
LVL 19

Accepted Solution

by:
cheekycj earned 50 total points
ID: 6855163
any luck?
0
 
LVL 2

Expert Comment

by:Cyril_H
ID: 6856065
Just a question, could you Output the content of your Array with CF_OBJECTDUMP ? If yes, i think that cheekycj's solution should work... if not, maybe some part of your Array are not defined at all !! Then you have to resolve your problem when you create the Array, not when the Array is created !

Could you display the content of your Array ?

Cyril
0
 
LVL 1

Author Comment

by:googlyralph
ID: 6941393
I have found an alternative to using htis template now, so i am not overly concerned why this doesnt work. I will assign the points to Cheekyci for the time and effort.

Thanks, GR.
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6942225
thanx for the pts.  Glad you got it working, would you care to post your solution for future reference?

Thanx,
CJ
0
 
LVL 1

Author Comment

by:googlyralph
ID: 6942241
Not really relevent, took an alternative route, and used client side validation instead.

Thanks for your help.

GR.
0

Featured Post

Complete Microsoft Windows PC® & Mac Backup

Backup and recovery solutions to protect all your PCs & Mac– on-premises or in remote locations. Acronis backs up entire PC or Mac with patented reliable disk imaging technology and you will be able to restore workstations to a new, dissimilar hardware in minutes.

Join & Write a Comment

In our day to day coding, how many times have we come across a necessity to check whether a URL is a broken link or not? For those of you that answered countless and are using ColdFusion like myself, then this article is for you.  It will show yo…
Meet the world's only “Transparent Cloud™” from Superb Internet Corporation. Now, you can experience firsthand a cloud platform that consistently outperforms Amazon Web Services (AWS), IBM’s Softlayer, and Microsoft’s Azure when it comes to CPU and …
Illustrator's Shape Builder tool will let you combine shapes visually and interactively. This video shows the Mac version, but the tool works the same way in Windows. To follow along with this video, you can draw your own shapes or download the file…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

758 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now